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CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY AND COUNTY OF DENVER AND FOR THE CITY OF AURORA, ADAMS AND ARAP AROE COUNTIES, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE PROGRAM On August 16, 1995, the Fed(:ral Emergency Management Agency (FEMA) identified Special Flood Hazard Areas (SFHAs) in the City of Aurora, Adams and Arapahoe Counties, Colorado, through issuance of a Flood Insurance Rate Map (FIRM). On March 4, 1996, and September 7, 1998, FEMA identified SFHAs in the City and County of Denver, Colorado, tprough issuance of a FIRM. The Federal Insurance and Mitigation Administration has determined that II}odification of the elevations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) for certain locations in these communities is appropriate. The modified Base Flood Elevations (BFEs) revise the FIRMs for the communities. The changes are being made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended (Title Xli of the Housing and Urban Developmer).t Act of 1968, Public Law 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. A hydraulic analysis was performed to incorporate the effects of the Westerly Creek Channel Restoration-Phase 1 along Westerly Creek from the confluence with Sand Creek to just downstream of Montview Boulevard. Based on this hydraulic analysis, BFEs and a regulatory floodway were established for Westerly Creek from approximately 1,500 feet upstream of the confluence with Sand Creek to the Ci~ and County of Denver/City of Aurora corporate boundary. Upstream of the corporate boundary, the revised analysis resulted in a revised delineation of the regulatory floodway, increases and decreases in SFHA width, and increased and decreased BFEs for Westerly Creek. The table below indicates existing and modified BFEs for selected locations along the affected lengths of the flooding source(s) cited above. Existing BFE Modified BFE Location (feet)* (feet) * 1 Approximately 1,400 feet upstream of confluence with Sand Creek 5,273 5,274 lApproximately 2,600 feet upstream of confluence with Sand Creek None 5,280 2 Approximately 2,600 feet downstream of Montview Boulevard 5,306 5,292 1,3 Approximately 700 feet downstream of Montview Boulevard 5,306 5,305 *Referenced to the National Geodetic Vertical Datum, rounded to the nearest whole foot ICity and County of Denver 2City and County of Denver/City of Aurora corporate boundary 3City of Aurora Under the above-mentioned Acts of 1968 and 1973, the Federal Insurance and Mitigation Administration must develop criteria for floodplain management. To participate in the National Flood Insurance Program (NFIP), the community must use the modified BFEs to administer the floodplain management measures ofthe NFIP. These modified BFEs will also be used to calculate the appropriate flood insurance premium rates for new buildings and their contents and for the second layer of insurance on existing buildings and contents.